Improved MKS Robin support (#19333)

Marlin/src/pins/stm32f1/pins_MKS_ROBIN.h

 #define DISABLE_JTAG
 
 //
-// Enable SD EEPROM to prevent infinite boot loop
+// EEPROM
 //
-#ifdef ARDUINO_ARCH_STM32
-  #define FLASH_EEPROM_EMULATION
+#if NO_EEPROM_SELECTED
+  #ifdef ARDUINO_ARCH_STM32
+    #define FLASH_EEPROM_EMULATION
+  #else
+    #define SDCARD_EEPROM_EMULATION
+  #endif
+#endif
+
+#if ENABLED(FLASH_EEPROM_EMULATION)
   #define EEPROM_PAGE_SIZE     (0x800U) // 2KB
   #define EEPROM_START_ADDRESS (0x8000000UL + (STM32_FLASH_SIZE) * 1024UL - (EEPROM_PAGE_SIZE) * 2UL)
   #define MARLIN_EEPROM_SIZE (EEPROM_PAGE_SIZE)
-#else
-  #define SDCARD_EEPROM_EMULATION
 #endif
 
 //
 #define TEMP_BED_PIN                        PC0   // TB1
 
 //
-// Heaters / Fans
+// Heaters
 //
 #define HEATER_0_PIN                        PC7   // HEATER1
 #define HEATER_1_PIN                        PA6   // HEATER2
 #define HEATER_BED_PIN                      PC6   // HOT BED
 
+//
+// Fan
+//
 #define FAN_PIN                             PA7   // FAN
 
-/**
- * Note: MKS Robin board is using SPI2 interface. Make sure your stm32duino library is configured accordingly
- */
+//
+// Thermocouples
+//
 //#define MAX6675_SS_PIN                    PE5   // TC1 - CS1
 //#define MAX6675_SS_PIN                    PE6   // TC2 - CS2
 
+//
+// Filament runout sensor
+//
+#define FIL_RUNOUT_PIN                      PF11  // MT_DET
+
+//
+// Power loss detection
+//
 #define POWER_LOSS_PIN                      PA2   // PW_DET
+
+//
+// Power supply control
+//
 #define PS_ON_PIN                           PA3   // PW_OFF
-#define FIL_RUNOUT_PIN                      PF11  // MT_DET
 
+//
+// Piezzoelectric speaker
+//
 #define BEEPER_PIN                          PC13
+
+//
+// Activity LED
+//
 #define LED_PIN                             PB2
 
+//
+// ESP12-S Wi-Fi module
+//
+#define WIFI_IO0_PIN                        PG1
+
+//
+// LCD screen
+//
 #if HAS_FSMC_TFT
   /**
    * Note: MKS Robin TFT screens use various TFT controllers
 
   #define TOUCH_BUTTONS_HW_SPI
   #define TOUCH_BUTTONS_HW_SPI_DEVICE          2
+  #define TFT_BUFFER_SIZE                  14400
 #endif
 
 #if NEED_TOUCH_PINS
   #define TOUCH_INT_PIN                     -1
 #endif
 
+// SPI2 is shared by LCD touch driver and flash
 // SPI1(PA7) & SPI3(PB5) not available
 #define SPI_DEVICE                             2
 
   #define SD_DETECT_PIN                     -1
 #endif
 
+//
+// Trinamic TMC2208/2209 UART
+//
 #if HAS_TMC_UART
   /**
-   * TMC2208/TMC2209 stepper drivers
+   * This board does not have dedicated TMC UART pins. Custom wiring is needed.
+   * You may uncomment one of the options below, or add it to your Configuration.h.
+   *
+   * When using up to four TMC2209 drivers, hardware serial is recommented on
+   * MSerial0 or MSerial1.
    *
-   * Hardware serial communication ports.
-   * If undefined software serial is used according to the pins below
+   * When using TMC2208 or more than four drivers, SoftwareSerial will be needed,
+   * to provide dedicated pins for each drier.
    */
-  //#define X_HARDWARE_SERIAL  MSerial1
-  //#define Y_HARDWARE_SERIAL  MSerial1
-  //#define Z_HARDWARE_SERIAL  MSerial1
-  //#define E0_HARDWARE_SERIAL MSerial1
-  //#define E1_HARDWARE_SERIAL MSerial1
-
-  // Unused servo pins may be repurposed with SoftwareSerialM
-  //#define X_SERIAL_TX_PIN                 PF8   // SERVO3_PIN -- XS2 - 6
-  //#define Y_SERIAL_TX_PIN                 PF9   // SERVO2_PIN -- XS2 - 5
-  //#define Z_SERIAL_TX_PIN                 PA1   // SERVO1_PIN -- XS1 - 6
-  //#define E0_SERIAL_TX_PIN                PC3   // SERVO0_PIN -- XS1 - 5
-  //#define X_SERIAL_RX_PIN      X_SERIAL_TX_PIN
-  //#define Y_SERIAL_RX_PIN      Y_SERIAL_TX_PIN
-  //#define Z_SERIAL_RX_PIN      Z_SERIAL_TX_PIN
-  //#define E0_SERIAL_RX_PIN    E0_SERIAL_TX_PIN
-
-  // Reduce baud rate for software serial reliability
-  #if HAS_TMC_SW_SERIAL
+
+  //#define TMC_HARDWARE_SERIAL
+  #if ENABLED(TMC_HARDWARE_SERIAL)
+    #define X_HARDWARE_SERIAL            MSerial0
+    #define X2_HARDWARE_SERIAL           MSerial0
+    #define Y_HARDWARE_SERIAL            MSerial0
+    #define Y2_HARDWARE_SERIAL           MSerial0
+    #define Z_HARDWARE_SERIAL            MSerial0
+    #define Z2_HARDWARE_SERIAL           MSerial0
+    #define E0_HARDWARE_SERIAL           MSerial0
+    #define E1_HARDWARE_SERIAL           MSerial0
+  #endif
+
+  //#define TMC_SOFTWARE_SERIAL
+  #if ENABLED(TMC_SOFTWARE_SERIAL)
+    #define X_SERIAL_TX_PIN                 PF8   // SERVO3_PIN -- XS2 - 6
+    #define Y_SERIAL_TX_PIN                 PF9   // SERVO2_PIN -- XS2 - 5
+    #define Z_SERIAL_TX_PIN                 PA1   // SERVO1_PIN -- XS1 - 6
+    #define E0_SERIAL_TX_PIN                PC3   // SERVO0_PIN -- XS1 - 5
+    #define X_SERIAL_RX_PIN      X_SERIAL_TX_PIN
+    #define Y_SERIAL_RX_PIN      Y_SERIAL_TX_PIN
+    #define Z_SERIAL_RX_PIN      Z_SERIAL_TX_PIN
+    #define E0_SERIAL_RX_PIN    E0_SERIAL_TX_PIN
     #define TMC_BAUD_RATE                  19200
   #endif
 #endif
+
+//
+// W25Q64 64Mb (8MB) SPI flash
+//
+#define HAS_SPI_FLASH                          1
+#if HAS_SPI_FLASH
+  #define SPI_FLASH_SIZE                0x800000  // 8MB
+  #define W25QXX_CS_PIN                     PG9
+  #define W25QXX_MOSI_PIN                   PB15
+  #define W25QXX_MISO_PIN                   PB14
+  #define W25QXX_SCK_PIN                    PB13
+#endif